package com.heima.gateway.filters;

import com.heima.gateway.config.AuthProperties;
import com.heima.gateway.util.JwtTool;
import com.hmall.common.exception.UnauthorizedException;
import lombok.RequiredArgsConstructor;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.util.AntPathMatcher;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.List;

@Component
@RequiredArgsConstructor
public class AuthGlobalFilter implements GlobalFilter, Ordered {
    private  final AuthProperties authProperties;
    private  final JwtTool jwtTool;
    private  final AntPathMatcher antPathMatcher = new AntPathMatcher();
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpRequest request = exchange.getRequest();
        if(isExclude(request.getPath().toString())){
            return chain.filter(exchange);
        }
        String token=null;
        List<String> headers = request.getHeaders().get("authorization");
        if (headers != null && !headers.isEmpty()){
            token = headers.get(0);
        }
        Long userId = null;
        try {
             userId = jwtTool.parseToken(token);
        }catch (UnauthorizedException e){
            ServerHttpResponse response = exchange.getResponse();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
           return   response.setComplete();
        }
        String userInfo = userId.toString();
        ServerWebExchange swe = exchange.mutate().request(builder -> builder.header("user-info", userInfo))
                .build();
        return chain.filter(swe);
    }

    private boolean isExclude(String path) {
        for(String pathPattern:authProperties.getExcludePaths()){
            if (antPathMatcher.match(pathPattern,path)) {
                return true;
            }
        }
    return false;

    }

    @Override
    public int getOrder() {
        return 0;
    }
}
